EP2133675A1 - Abnormal measurement detection device and method for infrared radiation thermometer - Google Patents
Abnormal measurement detection device and method for infrared radiation thermometer Download PDFInfo
- Publication number
- EP2133675A1 EP2133675A1 EP08739397A EP08739397A EP2133675A1 EP 2133675 A1 EP2133675 A1 EP 2133675A1 EP 08739397 A EP08739397 A EP 08739397A EP 08739397 A EP08739397 A EP 08739397A EP 2133675 A1 EP2133675 A1 EP 2133675A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermometer
- infrared radiation
- lens
- dummy
- contamination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 86
- 230000005855 radiation Effects 0.000 title claims abstract description 62
- 238000001514 detection method Methods 0.000 title claims description 41
- 238000000034 method Methods 0.000 title abstract description 6
- 230000002159 abnormal effect Effects 0.000 title 1
- 238000011109 contamination Methods 0.000 claims abstract description 67
- 230000005856 abnormality Effects 0.000 claims abstract description 59
- 230000007547 defect Effects 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 abstract description 24
- 238000001931 thermography Methods 0.000 abstract description 5
- 230000007257 malfunction Effects 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 18
- 238000010276 construction Methods 0.000 description 6
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910003472 fullerene Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0003—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0037—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the heat emitted by liquids
- G01J5/004—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the heat emitted by liquids by molten metals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0044—Furnaces, ovens, kilns
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/026—Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/05—Means for preventing contamination of the components of the optical system; Means for preventing obstruction of the radiation path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0803—Arrangements for time-dependent attenuation of radiation signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0846—Optical arrangements having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0859—Sighting arrangements, e.g. cameras
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/12—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/52—Radiation pyrometry, e.g. infrared or optical thermometry using comparison with reference sources, e.g. disappearing-filament pyrometer
- G01J5/53—Reference sources, e.g. standard lamps; Black bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Definitions
- the present invention relates to an art preventing measurement abnormality of an infrared radiation thermometer previously and detecting the measurement abnormality with regard to temperature measurement with the infrared radiation thermometer.
- thermography is used to measure surface temperature of a measurement object noncontactingly.
- the thermography shows temperature distribution of a surface of an object or an organism as an image, and temperature detected by an infrared radiation thermometer is grasped as a change of electrical characteristics and is re-converted into strength of light and outputted as an image, whereby continuous temperature distribution of the surface of the measurement object can be observed.
- infrared radiation thermometer (1) infrared radiation from a measurement object is condensed through a lens and focalized at a detecting element, (2) an electric signal corresponding to the strength of the infrared radiation is obtained from the detecting element, and (3) the signal is amplified, linearizedly revised and emissively revised by, and then displayed and outputted.
- thermography is also used in the field of casting so as to measure temperature of a cavity of a casting mold.
- step S1 A mold 30 is clamped (step S1), melted metal is injected into a cavity 33 so as to form a product (step S2), the mold is opened and the product is taken out from the mold 30 (step S3), the cavity 33 is splayed thereto with release agent and then dried by air blow (step S4), and then the mold 30 is clamped again (step S1) and the casting processes are shifted to the next cycle.
- thermometer 10 In the above casting processes, at the time of opening the casting mold, temperature of the cavity is measured with an infrared radiation thermometer 10. However, at the time of opening the casting mold, smoke, oil mist, the release agent and the like are scattered, whereby an objective lens 11 of the thermometer 10 is adhered thereto with oil, dust and the like and is contaminated. Accordingly, dirt is accumulated on the objective lens 11 of the thermometer 10 so as to cause measurement abnormality. Then, it is necessary to clean the surface of the objective lens 11 timely.
- the JP-U-3041996 discloses an art of an infrared radiation thermometer that a protection filter is detachably attached at a position before an objective lens so as to prevent adhesion of oil, dust and the like to the objective lens and to perform check of contamination and cleaning work quickly.
- the objective lens of the infrared radiation thermometer may be positioned at a position difficult to be viewed by an operator, such as a position above the casting mold or a position with high temperature. In this case, it is difficult to judge whether the measurement abnormality is caused by the contamination of the objective lens actually or not.
- the surface of the objective lens may be cleaned usually, but it is not productive.
- the present invention proposes an art of the infrared radiation thermometer used for thermography that measurement abnormality is detected and the cause of the measurement abnormality, such as contamination of the objective lens, defect of the mechanical part of the infrared radiation thermometer or the like, is estimated.
- An measurement abnormality detection device for an infrared radiation thermometer which is the first aspect of the present invention, includes a dummy lens, received light quantity measurement means and a determination means.
- the dummy lens is placed around an objective lens of the infrared radiation thermometer and arranged at a position and in an attitude that are more susceptible to contamination than the objective lens.
- the received light quantity measurement means for projecting light to the dummy lens at predetermined intervals or at a predetermined timing, for receiving the light reflected by the dummy lens, and for measuring received light quantity.
- the determination means calculate an attenuation rate of the projected light on the basis of the received light quantity measured by the received light quantity measurement means, estimates degree of contamination of the dummy lens on the basis of the calculated attenuation rate, and judges necessity of warning for contamination of the objective lens on the basis of the degree of contamination of the dummy lens.
- An measurement abnormality detection device for an infrared radiation thermometer which is the second aspect of the present invention, provided with a dummy lens, a received light quantity measurement means and a determination means.
- the dummy lens is placed around an objective lens of the infrared radiation thermometer so as to be at a position and in an attitude that are more susceptible to contamination than the objective lens.
- the determination means is connected to the received light quantity measurement means.
- the method includes a step that the received light quantity measurement means projects light to the dummy lens at predetermined intervals or at a predetermined timing, receives the light reflected by the dummy lens, and measures received light quantity, and a step that the determination means calculates attenuation rate of the projected light on the basis of the measured received light quantity, estimates degree of contamination of the dummy lens on the basis of the calculated attenuation rate, and judges, on the basis of the degree of contamination of the dummy lens, the necessity of warning for contamination of the objective lens.
- An measurement abnormality detection device for an infrared radiation thermometer which is the third aspect of the present invention, comprises a thermoelectric thermometer and a determination means.
- the thermoelectric thermometer measures temperature of a dummy black body point set at a part which can be regarded as a black body in a measurement object of the infrared radiation thermometer.
- the determination means obtains temperatures of the dummy black body point measured by the thermoelectric thermometer and by the infrared radiation thermometer, detects measurement abnormality on the basis of difference between these measured temperatures, and, when the measurement abnormality is detected, judges whether a defect exists in the infrared radiation thermometer or the thermoelectric thermometer on the basis of relation between the temperatures measured by the thermoelectric thermometer and by the infrared radiation thermometer.
- thermoelectric thermometer measures temperature of a dummy black body point set at a part which can be regarded as a black body in a measurement object of the infrared radiation thermometer.
- the determination means is connected to the infrared radiation thermometer and the thermoelectric thermometer.
- the method includes a step that temperature of the dummy black body point is measured by the infrared radiation thermometer and the thermoelectric thermometer, and a step that the determination means obtains the temperature measured by the thermoelectric thermometer and the temperature measured by the infrared radiation thermometer, detecting measurement abnormality on the basis of difference between these measured temperatures, and, when the measurement abnormality is detected, judges whether a defect exists in the infrared radiation thermometer or the thermoelectric thermometer on the basis of relation between the temperatures measured by the thermoelectric thermometer and by the infrared radiation thermometer.
- an infrared radiation thermometer 10 which is an embodiment of an infrared radiation thermometer according to the present invention, measures surface temperature of a cavity 33 of a mold 30.
- the thermometer 10 is provided therein with an measurement abnormality detection device, the device containing a lens contamination detection mechanism 20 for detecting contamination of a lens, a thermoelectric thermometer 63 for measuring temperature of the mold 30, which is a measurement object of the thermometer 10, and a determination means 50 electrically connected to the thermometer 10, the lens contamination detection mechanism 20 and the thermometer 63.
- the measurement abnormality detection device when contamination of an objective lens 11 of the thermometer 10 is notified or measurement abnormality occurs, it is specified whether the defect is caused by the thermometer 10 or the measurement abnormality detection device.
- the infrared radiation thermometer 10 and the measurement abnormality detection device are provided with the mold 30.
- the application is not limited thereto, and for example the devices may alternatively be provided with a pressing machine so as to measure temperature of a pressed product.
- the mold 30 has a fixed mold 31, a movable mold 32 which can be moved close to or apart from the fixed mold 31, and the like.
- the mold 30 is clamped (the fixed mold 31 is mated closely with the movable mold 32), the cavity 33 in which a casting is molded is formed in a mating surface between the fixed mold 31 and the movable mold 32.
- the reflectance of the surface of the cavity 33 is preferably small. Then, for reducing the reflectance of the surface of the cavity 33, for example carbon fullerene which is a black substance may be applied thereto.
- the carbon fullerene is known not to affect the mold 30 and the castings. The carbon fullerene hardly peels off from the mold 30 at the time of casting and is easily applied again if the carbon fullerene peels off. Accordingly, the carbon fullerene is suitable as a black substance to be applied to the cavity 33.
- thermometer 10 Explanation will be given on the construction of the thermometer 10.
- thermometer 10 is provided so as to measure the surface temperature of the cavity 33 of the new mold 30 noncontactingly and nondestructively.
- the thermometer 10 has the objective lens 11, a detecting element 12, an operation part 13 and an output part 14.
- the objective lens 11 of the thermometer 10 is arranged at the position at which the cavity 33, exposed on the mating surface between the fixed mold 31 and the movable mold 32 in the state that the mold 30 is opened (the fixed mold 31 and the movable mold 32 are separated), can be imaged.
- thermometer 10 infrared radiation radiated from a measurement object is condensed by the objective lens 11, focalized at the detecting element 12, and exchanged to an electric signal corresponding to the magnitude of the infrared radiation by the detecting element 12.
- the electric signal is amplified, linearizedly revised and emissively revised by the operation part 13, and then displayed and outputted by the output part 14.
- thermometer 10 is not limited to the above-mentioned construction, and a commonly obtainable infrared radiation thermometer may be used.
- the lens contamination detection mechanism 20 detecting degree of contamination of the objective lens 11 of the thermometer 10
- a dummy lens 21 and a laser displacement meter 22 are provided.
- the dummy lens 21 is placed in the periphery of the objective lens 11 of the thermometer 10 so as to be arranged at a position and in an attitude those are more susceptible to contamination than the objective lens 11.
- the dummy lens 21 is placed at a position and in an attitude those are close to the objective lens 11 of the thermometer 10 and more susceptible to be adhered thereto by gas, scattering thing and the like emitted from the cavity 33 of the new mold 30 so as to be not less susceptible to contamination than the objective lens 11.
- a member which is translucent, is hardly scared, and is not heat-distorted and reacted by gas, scattering thing and the like emitted from the cavity 33 of the new mold 30 (for example, a glass lens).
- the laser displacement meter 22 is provided at a position far from the dummy lens 21 for predetermined distance.
- the laser displacement meter 22 a commonly obtainable laser displacement meter can be used.
- the distance between the dummy lens 21 and the laser displacement meter 22 is preferable short so as to improve the accuracy.
- the laser displacement meter 22 is adopted to the lens contamination detection mechanism 20 as an embodiment of a received light quantity measurement means which projects light to the dummy lens 21 at each predetermined time or at a predetermined timing, receives the light reflected by the dummy lens 21, and measures the received light quantity (intensity).
- any member can be adopted which can project light to the dummy lens 21 and detect quantity of light reflected by the dummy lens 21.
- an illuminant and a luminance meter may be provided so that the illuminant projects light to the dummy lens 21 and the luminance meter measures quantity of light reflected by the dummy lens 21.
- the dummy lens 21 Since the dummy lens 21 is translucent, a part of light projected to the dummy lens 21 is transilluminated, another part thereof is absorbed, and the other part thereof is reflected. As shown in Fig. 5 , there is known that the larger the degree of contamination of the dummy lens 21 is, the small the received light quantity detected by the laser displacement meter 22 is. Then, the laser displacement meter 22 is provided so as not to measure the displacement from the laser displacement meter 22 to the dummy lens 21 but to measure the degree of contamination of the dummy lens 21 on the basis of the change of the received light quantity detected by the laser displacement meter 22 (attenuation quantity) in the state that the distance between the dummy lens 21 and the laser displacement meter 22 is substantially fixed. In the lens contamination detection mechanism 20, on the basis of the degree of contamination of the dummy lens 21, the degree of contamination of the objective lens 11 of the thermometer 10 is estimated.
- the laser displacement meter 22 has a luminous element 23, a photo detection element 24, an operation part 25 and an output part 26.
- Laser light projected from the luminous element 23 is condensed through a floodlight lens 23 a and is irradiated to the dummy lens 21.
- a part of the light diffusively reflected by the dummy lens 21 is detected by the photo detection element 24 through a photo detection lens 24a.
- the received light quantity (light intensity) detected by the photo detection element 24 is calculated by the operation part 25, displayed and outputted by the output part 26 and transmitted to the determination means 50 discussed later.
- the object of contamination detection is not the objective lens 11 of the thermometer 10 but the dummy lens 21. Accordingly, when the thermometer 10 is exchanged with another device, the lens contamination detection mechanism 20 can be used continuously. Maintenance of the thermometer 10 because of the lens contamination or the like may be performed as an outside order by a specialist. Then, the construction that the lens contamination detection mechanism 20 is independent of the thermometer 10 is suitable on the point that casting can be continued only by exchanging the thermometer 10.
- thermometer 63 is an embodiment of the thermoelectric thermometer according to the present invention.
- thermoelectric thermometer 63 measuring the temperature of the mold 30 is provided in the measurement abnormality detection device so as to detect the measurement abnormality of the thermometer 10.
- Both the thermometers 63 and 10 measure temperature of a dummy black body point 61 set at a part which can be regarded as a black body in the mold 30 being the measurement object of the infrared radiation thermometer 10.
- the dummy black body point 61 is set in or near the cavity 33 of the mold 30 at a part having shape absorbing infrared radiation (preferably, cone shape) or a part the most close to the black body of the cavity 33 being the measurement object in the shape characteristics. Accordingly, the dummy black body point 61 is provided in or near the cavity 33 of the mold 30 being the measurement object of the thermometer 10, whereby the measurement abnormality of the thermometer 10 can be detected accurately.
- a cone hole 62 is provided in or near the cavity 33 of the mold 30, and the bottom of the hole 62 is regarded as the dummy black body point 61.
- the dummy black body point 61 can be provided in the mold 30 by using a cone hole existing in the inner peripheral shape of the cavity 33 or by forming a cone hole newly near the cavity 33.
- a jig holding a thermocouple 64 of the thermometer 63 and the dummy black body point 61 is set in the jig.
- the thermometer 63 has the thermocouple 64, a detection part 65, an operation part 66 and an output part 67. Electromotive force generated in the thermocouple 64 is detected by the detection part 65. The temperature is calculated by the operation part 66 on the basis of the detected electromotive force, and is displayed and outputted by the output part 67 and transmitted to the determination means 50 discussed later.
- the thermometer 63 is provided so as to measure the temperature of the dummy black body point 61. However, it is difficult to measure the temperature of the dummy black body point 61 itself actually. Then, the thermocouple 64 is arranged near the dummy black body point 61, and the thermometer 63 measures temperature more close to the temperature of the dummy black body point 61 of the mold 30.
- thermometer 10 and the lens contamination detection mechanism 20 are connected to the determination means 50 so as to enable transmission of information.
- the determination means 50 obtain the information from these members so as to detect the contamination of the objective lens 11 of the thermometer 10, to judge whether the contamination of the objective lens 11 is necessary to be notified or not, and to judge the measurement abnormality of the thermometer 10.
- the determination means 50 is a so-called electronic calculator.
- the electronic calculator has a control part 51, an operation part 52, a storage part 53, an input/ output part 54, an operation input part 55 and an output part 56. These members are connected mutually through a bus for mutual exchange of information under the control of the control part 51.
- the control part 51 manages the actuation control of the whole determination means 50.
- the operation part 52 reads out various application programs stored in the storage part 53 and executes them so as to show the function of the determination means 50.
- the storage part 53 stores the various application programs and data.
- the input/ output part 54 transmits data to and receives data from an outside device for example through an optional network, and obtains information from the thermometer 10, the lens contamination detection mechanism 20 and a temperature revision device 60 and transmits signals to these members.
- the operation input part 55 is such as a keyboard or a mouse so as to input information to the determination means 50.
- the output part 56 is a display or a speaker outputting results of the processing of the determination means 50.
- quantity (intensity) of light projected to the dummy lens 21 is set by the laser displacement meter 22.
- the laser displacement meter 22 projects light to the dummy lens 21 at each predetermined time or at a predetermined timing and receives the light reflected by the dummy lens 21 so as to measure the received light quantity.
- the determination means 50 when the output value of the laser displacement meter 22 is obtained (S21), the decrement of the projected light is calculated on the basis of the output value (light quantity). Successively, in the determination means 50, the decrement is compared with a threshold set previously (S22) so as to estimate the degree of contamination of the dummy lens.
- the threshold is the decrement in the case that the objective lens 11 of the thermometer 10 is contaminated and accurate measurement value cannot be obtained so that the contamination of the lens must be notified, and is found experimentally and set in the determination means 50 previously.
- the determination means 50 judges whether the contamination of the objective lens is necessary to be notified or not on the basis of the degree of contamination of the dummy lens. Namely, when the decrement is larger than the threshold (YES at S22), the contamination of the objective lens is judged necessary to be notified (S23) and the notice is outputted through display or voice by the output part 56 (S24). It is timely to clean the objective lens 11 of the thermometer 10 at the time at which the notice is outputted. An operator may clean or exchange the objective lens 11 of the thermometer 10, or alternatively, a cleaning means such as a wiper for the objective lens 11 and the dummy lens 21 may be provided so as to clean them automatically.
- the dummy lens 21 is placed at the position and in the attitude that are more susceptible to contamination than the objective lens 11 of the thermometer 10 so that the dummy lens 21 is contaminated sooner than the objective lens 11 and the degree of contamination of the dummy lens 21 is larger than the objective lens 11. Therefore, the measurement abnormality of the thermometer 10 caused by the contamination of the objective lens 11 does not occur before the determination means 50 judges necessary to clean the objective lens 11 of the thermometer 10, thereby preventing the measurement abnormality previously.
- the lens contamination detection mechanism 20 may be used for detecting disturbance factors such as sunlight so as to prevent the measurement abnormality previously.
- the temperature of the dummy black body point 61 is measured by both the thermometer 10 and the thermometer 63 substantially simultaneously at each predetermined time or at a predetermined timing.
- the determination means 50 When the temperature of the dummy black body point 61 measured by the thermometer 63 and the temperature of the dummy black body point 61 measured by the thermometer 10 are obtained in the determination means 50 (S31), the determination means 50 comparatively operates these measured temperatures (S32), and the measurement abnormality is detected on the basis of the difference of the measured temperatures. When the difference of the measured temperatures of the thermometer 10 and the thermometer 63 is larger than the threshold (YES at S32), the determination means 50 judges that the measurement abnormality occurs.
- the determination means 50 judges whether the defect exists in the functional part of the thermometer 10 (the part except for the objective lens 11) or the thermometer 63 on the basis of the relation between the measured temperature of the thermometer 63 and the measured temperature of the thermometer 10.
- the determination means 50 judges whether the defect exists in an NG region 1 or an NG region 2 discussed later on the basis of the tendency of the measurement abnormality, that is, the magnitude relation between the measured temperature of the thermometer 10 and the measured temperature of the thermometer 63.
- an OK region and an NG region are set and stored in the storage part 53 of the determination means 50 previously.
- the NG region the NG region in which the measured temperature of the thermometer 10 is larger than the measured temperature of the thermometer 63 is regarded as the NG region 1
- the NG region in which the measured temperature of the thermometer 10 is larger than the measured temperature of the thermometer 63 is regarded as the NG region 2.
- the determination means 50 judges that the abnormality exists in the functional part of the thermometer 10 (S34).
- the cause of this measurement abnormality for example, defect of the detecting element 12 or the operation part 13 of the thermometer 10 can be given.
- thermometer 63 As the cause of this measurement abnormality, for example, break of the thermocouple 64 can be given.
- the judgment result of the determination means 50 is outputted through display or voice by the output part 56 as the notification of measurement abnormality (S36).
- the measured result is outputted from each of the laser displacement meter 22 and the thermometer 63 to the one determination means 50.
- the process in the case that the output is obtained from the laser displacement meter 22 and the process in the case that the output is obtained from the thermometer 10 and the thermometer 63 are performed inclusively by the determination means 50, thereby judging whether the measurement abnormality of the thermometer 10 is caused by the contamination of the objective lens 11 of the thermometer 10, the defect of the functional part of the thermometer 10, or the defect of the thermometer 63.
- the determination means 50 when the decrement of the output value obtained from the laser displacement meter 22 (received light quantity) is not larger than the predetermined threshold and the difference of measured temperatures of the thermometer 10 and the thermometer 63 is larger than the predetermined threshold, the defect of the thermometer 10 or the thermometer 63 is notified on the basis of whether the tendency of the measurement abnormality exists in the NG region 1 or the NG region 2. On the other hand, when the difference of measured temperatures of the thermometer 10 and the thermometer 63 is not larger than the predetermined threshold and the decrement of the output value obtained from the laser displacement meter 22 (received light quantity) is larger than the predetermined threshold, the contamination of the objective lens 11 of the thermometer 10 is notified.
- the determination means 50 can detect the measurement abnormality of the infrared radiation thermometer and estimate the cause thereof, whereby the functional part or the objective lens 11 of the infrared radiation thermometer 10, the lens contamination detection mechanism 20 or the thermoelectric thermometer 63 can be maintained efficiently.
- the present invention is available of temperature measurement with an infrared radiation thermometer and is especially suitable for an art preventing measurement abnormality of the infrared radiation thermometer previously and detecting the measurement abnormality.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
- The present invention relates to an art preventing measurement abnormality of an infrared radiation thermometer previously and detecting the measurement abnormality with regard to temperature measurement with the infrared radiation thermometer.
- Conventionally, in various fields such as engineering and medical science, thermography is used to measure surface temperature of a measurement object noncontactingly. The thermography shows temperature distribution of a surface of an object or an organism as an image, and temperature detected by an infrared radiation thermometer is grasped as a change of electrical characteristics and is re-converted into strength of light and outputted as an image, whereby continuous temperature distribution of the surface of the measurement object can be observed.
- For example, in the infrared radiation thermometer, (1) infrared radiation from a measurement object is condensed through a lens and focalized at a detecting element, (2) an electric signal corresponding to the strength of the infrared radiation is obtained from the detecting element, and (3) the signal is amplified, linearizedly revised and emissively revised by, and then displayed and outputted.
- Such thermography is also used in the field of casting so as to measure temperature of a cavity of a casting mold.
- Explanation will be given on an example of the casting processes referring
Fig. 1 . For example, the casting processes are performed insteps S 1 to S4 shown inFig. 1 . Amold 30 is clamped (step S1), melted metal is injected into acavity 33 so as to form a product (step S2), the mold is opened and the product is taken out from the mold 30 (step S3), thecavity 33 is splayed thereto with release agent and then dried by air blow (step S4), and then themold 30 is clamped again (step S1) and the casting processes are shifted to the next cycle. - In the above casting processes, at the time of opening the casting mold, temperature of the cavity is measured with an
infrared radiation thermometer 10. However, at the time of opening the casting mold, smoke, oil mist, the release agent and the like are scattered, whereby anobjective lens 11 of thethermometer 10 is adhered thereto with oil, dust and the like and is contaminated. Accordingly, dirt is accumulated on theobjective lens 11 of thethermometer 10 so as to cause measurement abnormality. Then, it is necessary to clean the surface of theobjective lens 11 timely. - For preventing contamination of a lens of an infrared radiation thermometer, the
JP-U-3041996 - However, in the casting, at the time of measuring the temperature of the cavity of the casting mold, the objective lens of the infrared radiation thermometer may be positioned at a position difficult to be viewed by an operator, such as a position above the casting mold or a position with high temperature. In this case, it is difficult to judge whether the measurement abnormality is caused by the contamination of the objective lens actually or not. For preventing the measurement abnormality caused by the contamination of the objective lens, the surface of the objective lens may be cleaned usually, but it is not productive.
- The present invention proposes an art of the infrared radiation thermometer used for thermography that measurement abnormality is detected and the cause of the measurement abnormality, such as contamination of the objective lens, defect of the mechanical part of the infrared radiation thermometer or the like, is estimated.
- An measurement abnormality detection device for an infrared radiation thermometer, which is the first aspect of the present invention, includes a dummy lens, received light quantity measurement means and a determination means. The dummy lens is placed around an objective lens of the infrared radiation thermometer and arranged at a position and in an attitude that are more susceptible to contamination than the objective lens. The received light quantity measurement means for projecting light to the dummy lens at predetermined intervals or at a predetermined timing, for receiving the light reflected by the dummy lens, and for measuring received light quantity. The determination means calculate an attenuation rate of the projected light on the basis of the received light quantity measured by the received light quantity measurement means, estimates degree of contamination of the dummy lens on the basis of the calculated attenuation rate, and judges necessity of warning for contamination of the objective lens on the basis of the degree of contamination of the dummy lens.
- An measurement abnormality detection device for an infrared radiation thermometer, which is the second aspect of the present invention, provided with a dummy lens, a received light quantity measurement means and a determination means. The dummy lens is placed around an objective lens of the infrared radiation thermometer so as to be at a position and in an attitude that are more susceptible to contamination than the objective lens. The determination means is connected to the received light quantity measurement means. The method includes a step that the received light quantity measurement means projects light to the dummy lens at predetermined intervals or at a predetermined timing, receives the light reflected by the dummy lens, and measures received light quantity, and a step that the determination means calculates attenuation rate of the projected light on the basis of the measured received light quantity, estimates degree of contamination of the dummy lens on the basis of the calculated attenuation rate, and judges, on the basis of the degree of contamination of the dummy lens, the necessity of warning for contamination of the objective lens.
- An measurement abnormality detection device for an infrared radiation thermometer, which is the third aspect of the present invention, comprises a thermoelectric thermometer and a determination means. The thermoelectric thermometer measures temperature of a dummy black body point set at a part which can be regarded as a black body in a measurement object of the infrared radiation thermometer. The determination means obtains temperatures of the dummy black body point measured by the thermoelectric thermometer and by the infrared radiation thermometer, detects measurement abnormality on the basis of difference between these measured temperatures, and, when the measurement abnormality is detected, judges whether a defect exists in the infrared radiation thermometer or the thermoelectric thermometer on the basis of relation between the temperatures measured by the thermoelectric thermometer and by the infrared radiation thermometer.
- An measurement abnormality detection device for an infrared radiation thermometer, which is the forth aspect of the present invention, provided with a thermoelectric thermometer and a determination means. The thermoelectric thermometer measures temperature of a dummy black body point set at a part which can be regarded as a black body in a measurement object of the infrared radiation thermometer. The determination means is connected to the infrared radiation thermometer and the thermoelectric thermometer. The method includes a step that temperature of the dummy black body point is measured by the infrared radiation thermometer and the thermoelectric thermometer, and a step that the determination means obtains the temperature measured by the thermoelectric thermometer and the temperature measured by the infrared radiation thermometer, detecting measurement abnormality on the basis of difference between these measured temperatures, and, when the measurement abnormality is detected, judges whether a defect exists in the infrared radiation thermometer or the thermoelectric thermometer on the basis of relation between the temperatures measured by the thermoelectric thermometer and by the infrared radiation thermometer.
-
-
Fig. 1 is a drawing of casting processes. -
Fig. 2 is a drawing of an infrared radiation thermometer according to the present invention and devices provided therewith. -
Fig. 3 is a drawing of an embodiment of a lens contamination detection mechanism and a thermoelectric thermometer according to the present invention. -
Fig. 4 is a drawing of the embodiment of the lens contamination detection mechanism and the thermoelectric thermometer according to the present invention. -
Fig. 5 is a diagram of relation between received light quantity and degree of contamination of a dummy lens. -
Fig. 6 is a diagram of relation between measured temperatures of the infrared radiation thermometer and the thermoelectric thermometer. -
Fig. 7 is a flow chart of an embodiment of contamination detection of an objective lens by a determination means according to the present invention. -
Fig. 8 is a flow chart of an embodiment of detection of measurement abnormality by the determination means according to the present invention. - As shown in
Fig. 2 , aninfrared radiation thermometer 10, which is an embodiment of an infrared radiation thermometer according to the present invention, measures surface temperature of acavity 33 of amold 30. Thethermometer 10 is provided therein with an measurement abnormality detection device, the device containing a lenscontamination detection mechanism 20 for detecting contamination of a lens, athermoelectric thermometer 63 for measuring temperature of themold 30, which is a measurement object of thethermometer 10, and a determination means 50 electrically connected to thethermometer 10, the lenscontamination detection mechanism 20 and thethermometer 63. - According to the measurement abnormality detection device, when contamination of an
objective lens 11 of thethermometer 10 is notified or measurement abnormality occurs, it is specified whether the defect is caused by thethermometer 10 or the measurement abnormality detection device. - In this embodiment, the
infrared radiation thermometer 10 and the measurement abnormality detection device are provided with themold 30. However, the application is not limited thereto, and for example the devices may alternatively be provided with a pressing machine so as to measure temperature of a pressed product. - Explanation will be given on the
mold 30 with which thethermometer 10 and the measurement abnormality detection device are provided. - As shown in
Figs. 3 and4 , themold 30 has a fixedmold 31, amovable mold 32 which can be moved close to or apart from the fixedmold 31, and the like. When themold 30 is clamped (the fixedmold 31 is mated closely with the movable mold 32), thecavity 33 in which a casting is molded is formed in a mating surface between the fixedmold 31 and themovable mold 32. - The reflectance of the surface of the
cavity 33 is preferably small. Then, for reducing the reflectance of the surface of thecavity 33, for example carbon fullerene which is a black substance may be applied thereto. The carbon fullerene is known not to affect themold 30 and the castings. The carbon fullerene hardly peels off from themold 30 at the time of casting and is easily applied again if the carbon fullerene peels off. Accordingly, the carbon fullerene is suitable as a black substance to be applied to thecavity 33. - By applying a thing with low reflectance to the
cavity 33 as mentioned above, measurement accuracy is improved in the case of measurement of temperature of themold 30 with thethermometer 10. That is because the high reflectance of thecavity 33 of thenew mold 30, which is lustrous silver, can be reduced by applying the black substance, and color shading, which occurs on thecavity 33 of themold 30 according to use status, can be reduced by applying the black substance, whereby the surface status of thecavity 33 is substantially fixed regardless of newness or oldness and use status of themold 30. - By applying the black substance to the
cavity 33, seizure of themold 30 can be reduced. - Explanation will be given on the construction of the
thermometer 10. - The
thermometer 10 is provided so as to measure the surface temperature of thecavity 33 of thenew mold 30 noncontactingly and nondestructively. - As shown in
Figs. 2 to 4 , thethermometer 10 has theobjective lens 11, a detectingelement 12, anoperation part 13 and anoutput part 14. Theobjective lens 11 of thethermometer 10 is arranged at the position at which thecavity 33, exposed on the mating surface between the fixedmold 31 and themovable mold 32 in the state that themold 30 is opened (thefixed mold 31 and themovable mold 32 are separated), can be imaged. - With regard to the
thermometer 10, infrared radiation radiated from a measurement object is condensed by theobjective lens 11, focalized at the detectingelement 12, and exchanged to an electric signal corresponding to the magnitude of the infrared radiation by the detectingelement 12. The electric signal is amplified, linearizedly revised and emissively revised by theoperation part 13, and then displayed and outputted by theoutput part 14. - However, the construction of the
thermometer 10 is not limited to the above-mentioned construction, and a commonly obtainable infrared radiation thermometer may be used. - Explanation will be given on the lens
contamination detection mechanism 20. - In the measurement abnormality detection device, as the lens
contamination detection mechanism 20 detecting degree of contamination of theobjective lens 11 of thethermometer 10, adummy lens 21 and alaser displacement meter 22 are provided. - As shown in
Figs. 2 to 4 , thedummy lens 21 is placed in the periphery of theobjective lens 11 of thethermometer 10 so as to be arranged at a position and in an attitude those are more susceptible to contamination than theobjective lens 11. In detail, thedummy lens 21 is placed at a position and in an attitude those are close to theobjective lens 11 of thethermometer 10 and more susceptible to be adhered thereto by gas, scattering thing and the like emitted from thecavity 33 of thenew mold 30 so as to be not less susceptible to contamination than theobjective lens 11. - As the
dummy lens 21, a member is adopted which is translucent, is hardly scared, and is not heat-distorted and reacted by gas, scattering thing and the like emitted from thecavity 33 of the new mold 30 (for example, a glass lens). - Then, the
laser displacement meter 22 is provided at a position far from thedummy lens 21 for predetermined distance. As thelaser displacement meter 22, a commonly obtainable laser displacement meter can be used. The distance between thedummy lens 21 and thelaser displacement meter 22 is preferable short so as to improve the accuracy. - The
laser displacement meter 22 is adopted to the lenscontamination detection mechanism 20 as an embodiment of a received light quantity measurement means which projects light to thedummy lens 21 at each predetermined time or at a predetermined timing, receives the light reflected by thedummy lens 21, and measures the received light quantity (intensity). - Then, instead of the
laser displacement meter 22, any member can be adopted which can project light to thedummy lens 21 and detect quantity of light reflected by thedummy lens 21. For example, an illuminant and a luminance meter may be provided so that the illuminant projects light to thedummy lens 21 and the luminance meter measures quantity of light reflected by thedummy lens 21. - Since the
dummy lens 21 is translucent, a part of light projected to thedummy lens 21 is transilluminated, another part thereof is absorbed, and the other part thereof is reflected. As shown inFig. 5 , there is known that the larger the degree of contamination of thedummy lens 21 is, the small the received light quantity detected by thelaser displacement meter 22 is. Then, thelaser displacement meter 22 is provided so as not to measure the displacement from thelaser displacement meter 22 to thedummy lens 21 but to measure the degree of contamination of thedummy lens 21 on the basis of the change of the received light quantity detected by the laser displacement meter 22 (attenuation quantity) in the state that the distance between thedummy lens 21 and thelaser displacement meter 22 is substantially fixed. In the lenscontamination detection mechanism 20, on the basis of the degree of contamination of thedummy lens 21, the degree of contamination of theobjective lens 11 of thethermometer 10 is estimated. - The
laser displacement meter 22 has aluminous element 23, aphoto detection element 24, anoperation part 25 and anoutput part 26. Laser light projected from theluminous element 23 is condensed through afloodlight lens 23 a and is irradiated to thedummy lens 21. A part of the light diffusively reflected by thedummy lens 21 is detected by thephoto detection element 24 through aphoto detection lens 24a. The received light quantity (light intensity) detected by thephoto detection element 24 is calculated by theoperation part 25, displayed and outputted by theoutput part 26 and transmitted to the determination means 50 discussed later. - With regard to the lens
contamination detection mechanism 20, the object of contamination detection is not theobjective lens 11 of thethermometer 10 but thedummy lens 21. Accordingly, when thethermometer 10 is exchanged with another device, the lenscontamination detection mechanism 20 can be used continuously. Maintenance of thethermometer 10 because of the lens contamination or the like may be performed as an outside order by a specialist. Then, the construction that the lenscontamination detection mechanism 20 is independent of thethermometer 10 is suitable on the point that casting can be continued only by exchanging thethermometer 10. - Explanation will be given on the
thermometer 63 which is an embodiment of the thermoelectric thermometer according to the present invention. - As shown in
Figs. 2 to 4 , thethermoelectric thermometer 63 measuring the temperature of themold 30 is provided in the measurement abnormality detection device so as to detect the measurement abnormality of thethermometer 10. Both thethermometers black body point 61 set at a part which can be regarded as a black body in themold 30 being the measurement object of theinfrared radiation thermometer 10. - The dummy
black body point 61 is set in or near thecavity 33 of themold 30 at a part having shape absorbing infrared radiation (preferably, cone shape) or a part the most close to the black body of thecavity 33 being the measurement object in the shape characteristics. Accordingly, the dummyblack body point 61 is provided in or near thecavity 33 of themold 30 being the measurement object of thethermometer 10, whereby the measurement abnormality of thethermometer 10 can be detected accurately. - In this embodiment, a cone hole 62 is provided in or near the
cavity 33 of themold 30, and the bottom of the hole 62 is regarded as the dummyblack body point 61. The dummyblack body point 61 can be provided in themold 30 by using a cone hole existing in the inner peripheral shape of thecavity 33 or by forming a cone hole newly near thecavity 33. - In addition, when the dummy
black body point 61 is difficult to be provided in themold 30, it may alternatively be constructed that a jig holding athermocouple 64 of thethermometer 63 and the dummyblack body point 61 is set in the jig. - The
thermometer 63 has thethermocouple 64, adetection part 65, anoperation part 66 and anoutput part 67. Electromotive force generated in thethermocouple 64 is detected by thedetection part 65. The temperature is calculated by theoperation part 66 on the basis of the detected electromotive force, and is displayed and outputted by theoutput part 67 and transmitted to the determination means 50 discussed later. - The
thermometer 63 is provided so as to measure the temperature of the dummyblack body point 61. However, it is difficult to measure the temperature of the dummyblack body point 61 itself actually. Then, thethermocouple 64 is arranged near the dummyblack body point 61, and thethermometer 63 measures temperature more close to the temperature of the dummyblack body point 61 of themold 30. - Explanation will be given on the construction of the determination means 50 which is an embodiment of the determination means according to the present invention.
- As shown in
Fig. 2 , thethermometer 10 and the lenscontamination detection mechanism 20 are connected to the determination means 50 so as to enable transmission of information. The determination means 50 obtain the information from these members so as to detect the contamination of theobjective lens 11 of thethermometer 10, to judge whether the contamination of theobjective lens 11 is necessary to be notified or not, and to judge the measurement abnormality of thethermometer 10. - The determination means 50 is a so-called electronic calculator. The electronic calculator has a
control part 51, anoperation part 52, astorage part 53, an input/output part 54, anoperation input part 55 and anoutput part 56. These members are connected mutually through a bus for mutual exchange of information under the control of thecontrol part 51. - The
control part 51 manages the actuation control of the whole determination means 50. Theoperation part 52 reads out various application programs stored in thestorage part 53 and executes them so as to show the function of the determination means 50. Thestorage part 53 stores the various application programs and data. The input/output part 54 transmits data to and receives data from an outside device for example through an optional network, and obtains information from thethermometer 10, the lenscontamination detection mechanism 20 and a temperature revision device 60 and transmits signals to these members. Theoperation input part 55 is such as a keyboard or a mouse so as to input information to the determination means 50. Theoutput part 56 is a display or a speaker outputting results of the processing of the determination means 50. - Explanation will be given on the processing of the determination means 50 obtaining measurement output value of the
laser displacement meter 22 referringFig. 7 . - In the determination means 50, quantity (intensity) of light projected to the
dummy lens 21 is set by thelaser displacement meter 22. When the casting is started, thelaser displacement meter 22 projects light to thedummy lens 21 at each predetermined time or at a predetermined timing and receives the light reflected by thedummy lens 21 so as to measure the received light quantity. - In the determination means 50, when the output value of the
laser displacement meter 22 is obtained (S21), the decrement of the projected light is calculated on the basis of the output value (light quantity). Successively, in the determination means 50, the decrement is compared with a threshold set previously (S22) so as to estimate the degree of contamination of the dummy lens. The threshold is the decrement in the case that theobjective lens 11 of thethermometer 10 is contaminated and accurate measurement value cannot be obtained so that the contamination of the lens must be notified, and is found experimentally and set in the determination means 50 previously. - Then, the determination means 50 judges whether the contamination of the objective lens is necessary to be notified or not on the basis of the degree of contamination of the dummy lens. Namely, when the decrement is larger than the threshold (YES at S22), the contamination of the objective lens is judged necessary to be notified (S23) and the notice is outputted through display or voice by the output part 56 (S24). It is timely to clean the
objective lens 11 of thethermometer 10 at the time at which the notice is outputted. An operator may clean or exchange theobjective lens 11 of thethermometer 10, or alternatively, a cleaning means such as a wiper for theobjective lens 11 and thedummy lens 21 may be provided so as to clean them automatically. - As mentioned above, the
dummy lens 21 is placed at the position and in the attitude that are more susceptible to contamination than theobjective lens 11 of thethermometer 10 so that thedummy lens 21 is contaminated sooner than theobjective lens 11 and the degree of contamination of thedummy lens 21 is larger than theobjective lens 11. Therefore, the measurement abnormality of thethermometer 10 caused by the contamination of theobjective lens 11 does not occur before the determination means 50 judges necessary to clean theobjective lens 11 of thethermometer 10, thereby preventing the measurement abnormality previously. - In addition to the contamination of the
objective lens 11 of thethermometer 10, the lenscontamination detection mechanism 20 may be used for detecting disturbance factors such as sunlight so as to prevent the measurement abnormality previously. - Explanation will be given on the processing of the determination means 50 obtaining measured temperature of the
thermometer 63 and measured temperature of thethermometer 10 referringFig. 8 . - With regard to the casting processes shown in
Fig. 1 , in the state that themold 30 is opened (steps S3 and S4), the temperature of the dummyblack body point 61 is measured by both thethermometer 10 and thethermometer 63 substantially simultaneously at each predetermined time or at a predetermined timing. - When the temperature of the dummy
black body point 61 measured by thethermometer 63 and the temperature of the dummyblack body point 61 measured by thethermometer 10 are obtained in the determination means 50 (S31), the determination means 50 comparatively operates these measured temperatures (S32), and the measurement abnormality is detected on the basis of the difference of the measured temperatures. When the difference of the measured temperatures of thethermometer 10 and thethermometer 63 is larger than the threshold (YES at S32), the determination means 50 judges that the measurement abnormality occurs. - When the measurement abnormality is detected, the determination means 50 judges whether the defect exists in the functional part of the thermometer 10 (the part except for the objective lens 11) or the
thermometer 63 on the basis of the relation between the measured temperature of thethermometer 63 and the measured temperature of thethermometer 10. - At this time, the determination means 50 judges whether the defect exists in an
NG region 1 or anNG region 2 discussed later on the basis of the tendency of the measurement abnormality, that is, the magnitude relation between the measured temperature of thethermometer 10 and the measured temperature of thethermometer 63. - As shown in
Fig. 6 , concerning the relation between the measured temperature of thethermometer 10 and the measured temperature of thethermometer 63, an OK region and an NG region are set and stored in thestorage part 53 of the determination means 50 previously. With regard to the NG region, the NG region in which the measured temperature of thethermometer 10 is larger than the measured temperature of thethermometer 63 is regarded as theNG region 1, and the NG region in which the measured temperature of thethermometer 10 is larger than the measured temperature of thethermometer 63 is regarded as theNG region 2. - When the tendency of the measurement abnormality exists in the NG region 1 (YES at S33), the determination means 50 judges that the abnormality exists in the functional part of the thermometer 10 (S34). As the cause of this measurement abnormality, for example, defect of the detecting
element 12 or theoperation part 13 of thethermometer 10 can be given. - On the other hand, when the tendency of the measurement abnormality exists in the NG region 2 (NO at S33), it is judged that the abnormality exists in the thermometer 63 (S35). As the cause of this measurement abnormality, for example, break of the
thermocouple 64 can be given. - The judgment result of the determination means 50 is outputted through display or voice by the
output part 56 as the notification of measurement abnormality (S36). - With regard to the measurement abnormality detection device according to this embodiment, the measured result is outputted from each of the
laser displacement meter 22 and thethermometer 63 to the one determination means 50. According to this construction, the process in the case that the output is obtained from thelaser displacement meter 22 and the process in the case that the output is obtained from thethermometer 10 and thethermometer 63 are performed inclusively by the determination means 50, thereby judging whether the measurement abnormality of thethermometer 10 is caused by the contamination of theobjective lens 11 of thethermometer 10, the defect of the functional part of thethermometer 10, or the defect of thethermometer 63. - Namely, in the determination means 50, when the decrement of the output value obtained from the laser displacement meter 22 (received light quantity) is not larger than the predetermined threshold and the difference of measured temperatures of the
thermometer 10 and thethermometer 63 is larger than the predetermined threshold, the defect of thethermometer 10 or thethermometer 63 is notified on the basis of whether the tendency of the measurement abnormality exists in theNG region 1 or theNG region 2. On the other hand, when the difference of measured temperatures of thethermometer 10 and thethermometer 63 is not larger than the predetermined threshold and the decrement of the output value obtained from the laser displacement meter 22 (received light quantity) is larger than the predetermined threshold, the contamination of theobjective lens 11 of thethermometer 10 is notified. - Accordingly, the determination means 50 can detect the measurement abnormality of the infrared radiation thermometer and estimate the cause thereof, whereby the functional part or the
objective lens 11 of theinfrared radiation thermometer 10, the lenscontamination detection mechanism 20 or thethermoelectric thermometer 63 can be maintained efficiently. - The present invention is available of temperature measurement with an infrared radiation thermometer and is especially suitable for an art preventing measurement abnormality of the infrared radiation thermometer previously and detecting the measurement abnormality.
Claims (4)
- An measurement abnormality detection device for an infrared radiation thermometer comprising:a dummy lens placed around an objective lens of the infrared radiation thermometer and arranged at a position and in an attitude that are more susceptible to contamination than the objective lens;a received light quantity measurement means for projecting light to the dummy lens at predetermined intervals or at a predetermined timing, for receiving the light reflected by the dummy lens, and for measuring received light quantity; anda determination means for calculating attenuation rate of the projected light on the basis of the received light quantity measured by the received light quantity measurement means, for estimating degree of contamination of the dummy lens on the basis of the calculated attenuation rate, and for judging necessity of warning for contamination of the objective lens on the basis of the degree of contamination of the dummy lens.
- An measurement abnormality detection method for an infrared radiation thermometer comprising:preparing a dummy lens placed around an objective lens of the infrared radiation thermometer and arranged at a position and in an attitude that are more susceptible to contamination than the objective lens, a received light quantity measurement means, and a determination means connected to the received light quantity measurement means;projecting light to the dummy lens at predetermined intervals or at a predetermined timing, receives the light reflected by the dummy lens, and measuring a received light quantity with the received light quantity measurement means; andcalculating an attenuation rate of the projected light on the basis of the measured received light quantity, estimating a degree of contamination of the dummy lens on the basis of the calculated attenuation rate, and judging necessity of warning for contamination of the objective lens on the basis of the degree of contamination of the dummy lens with the determination means.
- An measurement abnormality detection device for an infrared radiation thermometer comprising:a thermoelectric thermometer for measuring temperature of a dummy black body point set at a part which can be regarded as a black body in a measurement object of the infrared radiation thermometer; anda determination means for obtaining temperatures of the dummy black body point measured by the thermoelectric thermometer and by the infrared radiation thermometer, detecting measurement abnormality on the basis of difference between these measured temperatures, and for judging, when the measurement abnormality is detected, whether a defect exists in the infrared radiation thermometer or the thermoelectric thermometer on the basis of a relation between the temperatures measured by the thermoelectric thermometer and by the infrared radiation thermometer.
- An measurement abnormality detection method for an infrared radiation thermometer comprising:preparing a thermoelectric thermometer for measuring temperature of a dummy black body point set at a part which can be regarded as a black body in a measurement object of the infrared radiation thermometer and a determination means connected to the infrared radiation thermometer and the thermoelectric thermometer;measuring temperature of the dummy black body point with the infrared radiation thermometer and the thermoelectric thermometer; andobtaining the temperatures measured by the thermoelectric thermometer and by the infrared radiation thermometer, detecting measurement abnormality on the basis of a difference between these measured temperatures, and judging, when the measurement abnormality is detected, whether a defect exists in the infrared radiation thermometer or the thermoelectric thermometer on the basis of a relation between the temperatures measured by the thermoelectric thermometer and by the infrared radiation thermometer.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007094131A JP4668229B2 (en) | 2007-03-30 | 2007-03-30 | Measurement abnormality detection device and measurement abnormality detection method for infrared radiation thermometer |
PCT/JP2008/056283 WO2008123487A1 (en) | 2007-03-30 | 2008-03-25 | Abnormal measurement detection device and method for infrared radiation thermometer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2133675A1 true EP2133675A1 (en) | 2009-12-16 |
EP2133675A4 EP2133675A4 (en) | 2014-05-28 |
Family
ID=39830965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08739397.1A Withdrawn EP2133675A4 (en) | 2007-03-30 | 2008-03-25 | Abnormal measurement detection device and method for infrared radiation thermometer |
Country Status (6)
Country | Link |
---|---|
US (2) | US8445847B2 (en) |
EP (1) | EP2133675A4 (en) |
JP (1) | JP4668229B2 (en) |
CN (1) | CN101652644B (en) |
BR (1) | BRPI0809203A2 (en) |
WO (1) | WO2008123487A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022002367A1 (en) * | 2020-06-30 | 2022-01-06 | MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. | Method for controlling a flux distribution of evaporated source material, detector for measuring electromagnetic radiation reflected on a source surface and system for thermal evaporation with electromagnetic radiation |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4826656B2 (en) * | 2009-06-09 | 2011-11-30 | コニカミノルタビジネステクノロジーズ株式会社 | Temperature detection apparatus and image forming apparatus provided with temperature detection apparatus |
US9509923B2 (en) * | 2012-01-10 | 2016-11-29 | General Electric Company | Continuous infrared thermography monitoring and life management system for heat recovery steam generators |
CN102661799B (en) * | 2012-05-16 | 2014-11-19 | 广东电网公司珠海供电局 | Fault positioning method and system |
EP2778012B1 (en) * | 2013-03-15 | 2019-07-24 | Ecm S.P.A. | Integrity verification of IR detectors for a rail vehicle |
JP6157988B2 (en) * | 2013-08-21 | 2017-07-05 | 株式会社東芝 | Battery module |
CN107543613B (en) * | 2017-08-23 | 2024-02-02 | 西安科技大学 | Underground infrared temperature measurement precision influence factor testing device and method |
JP7067315B2 (en) * | 2018-06-28 | 2022-05-16 | コニカミノルタ株式会社 | Image forming device |
TWI705235B (en) | 2019-07-19 | 2020-09-21 | 財團法人工業技術研究院 | Sensing devices |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435093A (en) * | 1981-12-08 | 1984-03-06 | Bethlehem Steel Corporation | Pyrometer with sighting window cleanliness monitor |
JPH05146844A (en) * | 1991-11-27 | 1993-06-15 | Shigehiro Murata | Method for controlling temperature of shell molding machine |
US5812270A (en) * | 1997-09-17 | 1998-09-22 | Ircon, Inc. | Window contamination detector |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59160723A (en) * | 1983-03-04 | 1984-09-11 | Nippon Steel Corp | Calibrating method of radiation thermometer |
CN1032979A (en) | 1987-10-31 | 1989-05-17 | 昆明物理研究所 | In warm blackbody radiation source |
JPH0341996U (en) | 1989-08-31 | 1991-04-22 | ||
JPH0491919A (en) * | 1990-08-08 | 1992-03-25 | Chino Corp | Measuring device for mold temperature |
JPH05133816A (en) * | 1991-11-11 | 1993-05-28 | Yamatake Honeywell Co Ltd | Temperature measuring instrument |
JPH06174553A (en) * | 1992-12-08 | 1994-06-24 | Sanyu Kogyo Kk | Measuring method for temperature of mold |
JPH07333072A (en) * | 1994-06-08 | 1995-12-22 | Chino Corp | Comparing device of output of thermocouple |
JPH09210795A (en) | 1996-02-06 | 1997-08-15 | Tokai Konetsu Kogyo Co Ltd | Graphite furnace having convenient temperature calbrating function for radiation thermometer |
JPH09264794A (en) | 1996-03-29 | 1997-10-07 | N Ii C Medical Syst Kk | Infrared imaging apparatus |
JP3041996U (en) | 1997-03-31 | 1997-10-03 | 株式会社浅野研究所 | Radiation thermometer for resin sheet molding equipment |
JP2000046656A (en) * | 1998-07-28 | 2000-02-18 | Ishikawajima Harima Heavy Ind Co Ltd | Radiation thermometer having light receiving loss compensation function and temperature measuring method therefor |
JP3939487B2 (en) | 2000-05-11 | 2007-07-04 | 独立行政法人科学技術振興機構 | Thermophysical property measurement system |
JP2002090224A (en) * | 2000-09-20 | 2002-03-27 | Nkk Corp | Thermometer anomaly detecting method and device |
JP2003130366A (en) * | 2001-10-25 | 2003-05-08 | Matsushita Electric Ind Co Ltd | Heating cooker |
JP3912738B2 (en) * | 2002-03-29 | 2007-05-09 | 能美防災株式会社 | Tunnel disaster prevention system and flame detector |
-
2007
- 2007-03-30 JP JP2007094131A patent/JP4668229B2/en active Active
-
2008
- 2008-03-25 CN CN2008800107942A patent/CN101652644B/en active Active
- 2008-03-25 US US12/593,541 patent/US8445847B2/en active Active
- 2008-03-25 BR BRPI0809203-6A2A patent/BRPI0809203A2/en not_active IP Right Cessation
- 2008-03-25 WO PCT/JP2008/056283 patent/WO2008123487A1/en active Application Filing
- 2008-03-25 EP EP08739397.1A patent/EP2133675A4/en not_active Withdrawn
-
2012
- 2012-08-06 US US13/567,866 patent/US9163992B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435093A (en) * | 1981-12-08 | 1984-03-06 | Bethlehem Steel Corporation | Pyrometer with sighting window cleanliness monitor |
JPH05146844A (en) * | 1991-11-27 | 1993-06-15 | Shigehiro Murata | Method for controlling temperature of shell molding machine |
US5812270A (en) * | 1997-09-17 | 1998-09-22 | Ircon, Inc. | Window contamination detector |
Non-Patent Citations (1)
Title |
---|
See also references of WO2008123487A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022002367A1 (en) * | 2020-06-30 | 2022-01-06 | MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. | Method for controlling a flux distribution of evaporated source material, detector for measuring electromagnetic radiation reflected on a source surface and system for thermal evaporation with electromagnetic radiation |
CN115867688A (en) * | 2020-06-30 | 2023-03-28 | 马克思-普朗克科学促进协会 | Method for controlling the magnetic flux distribution of an evaporation source material, detector for measuring electromagnetic radiation reflected at the source surface and system for thermal evaporation using electromagnetic radiation |
Also Published As
Publication number | Publication date |
---|---|
US9163992B2 (en) | 2015-10-20 |
US20100073670A1 (en) | 2010-03-25 |
CN101652644A (en) | 2010-02-17 |
EP2133675A4 (en) | 2014-05-28 |
CN101652644B (en) | 2011-10-12 |
JP2008249638A (en) | 2008-10-16 |
JP4668229B2 (en) | 2011-04-13 |
US20130021601A1 (en) | 2013-01-24 |
WO2008123487A1 (en) | 2008-10-16 |
BRPI0809203A2 (en) | 2014-09-23 |
US8445847B2 (en) | 2013-05-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9163992B2 (en) | Abnormal measurement detection device and method for infrared radiation thermometer | |
US6195581B1 (en) | Process for evaluating the signal of an infrared thermometer, and infrared thermometer | |
US10083589B2 (en) | Method and device for monitoring a protective glass | |
US20090304041A1 (en) | Apparatus for the Determination of the Surface Moisture of a Test Object | |
US9546909B2 (en) | Apparatus and methods for continuous temperature measurement of molten metals | |
JP2014214875A (en) | Turbomachine lubricating oil analyzer system, computer program product and related methods | |
JP2008249515A (en) | Temperature distribution measuring system and temperature distribution measuring method | |
WO2012070327A1 (en) | Coke oven monitoring method, furnace wall management method, and monitoring system | |
JP2007152427A (en) | Method and apparatus for determining press defect, and press forming apparatus | |
KR100809059B1 (en) | Tradition metallic pattern control system in using analysis molding | |
KR100777041B1 (en) | Device and Method for Heat Test | |
CN105286812A (en) | Body temperature measurement method and device | |
US6840671B2 (en) | System and method for non-contact temperature sensing | |
CN216525630U (en) | Experimental device for research vacancy height is to oil bath fire heat feedback mechanism influence | |
JP2006023260A (en) | Method and instrument for measuring temperature distribution in optical fiber | |
JP7465698B2 (en) | Peeling diagnostic device | |
ITMI20012475A1 (en) | INSTRUMENT FOR MEASURING THE POWER OF RADIATION EMITTED BY A LASER SOURCE AND PROCEDURE IMPLEMENTED FOR MEASURING POWER | |
CN112831623A (en) | Method for preventing blast furnace hearth from burning through | |
CN117387775B (en) | Infrared temperature measurement and wireless temperature measurement monitoring system for electrical equipment | |
US5864776A (en) | Apparatus and method for detecting an error in the placement of a lead frame on a surface of a die mold | |
US20110158282A1 (en) | Method for detecting changes in a vacuum state in a detector of a thermal camera | |
JP2008180540A (en) | Hydrogen concentration measuring method and device in molten metal | |
KR101993895B1 (en) | A device for measurement of oil degradation | |
CN211234775U (en) | Novel heat supply network temperature measurement monitor | |
JP2004339944A (en) | Monitoring device and method of gas turbine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20090930 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: MEIWA E-TEC CO., LTD. Owner name: TOYOTA JIDOSHA KABUSHIKI KAISHA |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20140430 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: G01J 5/52 20060101ALI20140424BHEP Ipc: G01J 5/04 20060101ALI20140424BHEP Ipc: G01J 5/00 20060101AFI20140424BHEP |
|
17Q | First examination report despatched |
Effective date: 20160810 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20161221 |